US6831789B2 - Rotating periodic color-regulating module of an image display device - Google Patents

Rotating periodic color-regulating module of an image display device Download PDF

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Publication number
US6831789B2
US6831789B2 US10/409,179 US40917903A US6831789B2 US 6831789 B2 US6831789 B2 US 6831789B2 US 40917903 A US40917903 A US 40917903A US 6831789 B2 US6831789 B2 US 6831789B2
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United States
Prior art keywords
light
color
beams
filters
guiding elements
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Expired - Fee Related
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US10/409,179
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US20040075911A1 (en
Inventor
Sean Chang
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Delta Electronics Inc
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Delta Electronics Inc
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
    • G02B27/102—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/0875—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more refracting elements
    • G02B26/0883—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more refracting elements the refracting element being a prism
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/1086—Beam splitting or combining systems operating by diffraction only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
    • H04N9/3111—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying the colours sequentially, e.g. by using sequentially activated light sources
    • H04N9/3117—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying the colours sequentially, e.g. by using sequentially activated light sources by using a sequential colour filter producing two or more colours simultaneously, e.g. by creating scrolling colour bands

Definitions

  • the invention relates to a rotating periodic color-regulating module of the image display device for regulating the color of a light beam. More particularly, the invention relates to a rotating periodic color-regulating module that can improve the usage of light.
  • the image display device is used to project an image on a screen for display or teaching purposes.
  • the image display device uses a picture generation device to produce all kinds of images. It has to provide beams of light with rapid and periodic color changes in order to form a color picture. Therefore, most of the image display devices utilize the design of a color wheel to satisfy such a requirement.
  • the color wheel is composed of a plurality of color filters, by which light is filtered to allow only a monotonic color beam to pass.
  • the color wheel is rotating in such a way that the color filters are rotated to the optical path to provide beams of light with rapid and periodic color changes. Since it needs a rotating color wheel to change colors, the color filters are often made in wedge shapes and attached on a substrate to form the color wheel. The color wheel is then installed on a motor.
  • the color wheel is generally composed of red (R), green (G) and blue (B) filter thin films and blank parts.
  • the R, G and B colors have equal areas and occupy 85% of the total area. The rest part is blank.
  • R, G and B colors have equal areas and occupy 85% of the total area. The rest part is blank.
  • the green and blue filter thin films work in the same way. Excluding the 15% blank area, optical energy that can pass through the color wheel is roughly 40% of the original optical energy emitted. Considering the optical loss, the true optical energy that can be used is only slightly more than 30%.
  • the invention provides a rotating periodic color-regulating module of the image display device, which can increase the usage of light but does not increase the manufacturing cost.
  • a mirror is provided on the entering place of light to reflect light reflected by the color filters on the color wheel. This can effectively increase the usage of light.
  • a grating element is installed at the entering place of light.
  • a beam of light passes the grating element, it is split into several beams of light according to different wavelengths moving toward the corresponding filters. This further increases the percentage of light that passes through the color wheel.
  • a color separating light guide is installed after the filter so that light is guided to emit homogeneously.
  • a color-regulating module is provided at the light output place. It is a polygonal prism, which is mounted on a rotating motor to rotate. When a beam of light passes through the prism, it is deflected by an angle due to the different refraction indices between the prism and the air. Light of different wavelengths will be deflected by different angles too. As the prism rotates to a specific angle, light will greatly change its deflection angle and therefore the outgoing beams. With the combination of a high-speed rotating prism and the above-mentioned homogeneous light, beams of light with rapidly and periodically color changes can be provided to an image display device. Therefore, the disclosed module does not only increase the use of light, but has a simple structure that allows mass production at a lower cost.
  • FIG. 1 is a schematic view of the invention combined into an image display device
  • FIG. 2 is a schematic view of the structure of the invention
  • FIG. 3A is a side view of the disclosed light guiding device
  • FIG. 3B is a schematic view of the disclosed guiding device guiding the optical path.
  • FIGS. 4A to 4 J are schematic views of color-regulating processes according to the invention.
  • the disclosed rotating periodic color-regulating module 30 is designed for an image display device.
  • the image display device further includes a light source system 40 , a picture generation device 50 , and an optical projection system 60 .
  • the rotating periodic color-regulating module 30 can modulates an incident beam of light 80 emitted from the light source system 40 into different colors and projects them on a screen 70 via the picture generation device 50 and the optical projection system 60 .
  • the structure of the rotating periodic color-regulating module 30 is schematically shown in FIG. 2 . It includes a color separating light guide 31 and a color-regulating processor 32 .
  • the color separating light guide 31 includes a beam splitter 33 and a plurality of light guiding elements, such as the first light guiding element 313 , the second light guiding element 314 , and the third light guiding element 315 shown in the drawing.
  • the beam splitter 33 has an input terminal 311 and an output terminal 312 .
  • a grating element 3111 is provided in the middle of the input terminal 311 and is surrounded by a mirror 3112 (shown in FIG. 3 A).
  • the output terminal 312 is installed with filters corresponding to the guiding elements.
  • filters there are a first color filter 3121 , a second color filter 3122 , and a third color filter 3123 corresponding to the first, second and third light guiding elements 313 , 314 and 315 , respectively.
  • an incident beam 80 enters the input terminal 311 and hits the beam splitter 33 , it is split into several beams by the grating 3111 .
  • it is split into a first beam 81 , a second beam 82 , and a third beam 83 moving toward the first, second and third light guiding elements 313 , 314 and 315 , respectively.
  • it is preferred to split the light into beams with red (R), green (G), and blue (B) wavelengths.
  • the grating element 3111 is not able to completely split the incident beam into the R, G, and B beams, but only focuses most of the energy of the colors within the corresponding beams.
  • the first beam 81 , the second beam 82 , and the third beam 83 roughly propagate toward the first color filter 3121 , the second color filter 3122 , and the third color filter 3123 , respectively.
  • the first color filter 3121 , the second color filter 3122 , and the third color filter 3123 are designed such that only light with specific wavelengths in the first beam 81 , the second beam 82 , and the third beam 83 can pass through.
  • the first color filter 3121 the second color filter 3122 , and the third color filter 3123 .
  • Part of the light is reflected by the three color filters back to the input terminal 311 .
  • the grating element 3111 positioned at the input terminal 311 is surrounded by a mirror 3112 . Therefore, the reflected light from the color filters is reflected again back to the corresponding three filters. At this point, the light beams partially penetrate through the corresponding color filters again and enter the light guiding elements 313 , 314 and 315 . With such reflections back and forth, the usage of light can be increased to more than 40% or even close to 50%.
  • the first beam 81 , the second beam 82 , and the third beam 83 After passing through the first color filter 3121 , the second color filter 3122 , and the third color filter 3123 , the first beam 81 , the second beam 82 , and the third beam 83 enter the first light guiding element 313 , the second light guiding element 314 , and the third light guiding element 315 , respectively.
  • the beams keep bouncing off the walls of the guiding elements until they come out from the other sides homogeneously, as shown in FIG. 4 A.
  • the beams coming out of the guiding elements enter the color-regulating processor 32 , which is basically a polygonal prism mounted on a rotational axis 321 .
  • the rotational axis 321 is driven by a motor (not shown) into rotation. It in turn brings the color-regulating processor into rotation.
  • the first beam 81 , the second beam 82 , and the third beam 83 continuously change their outgoing direction, providing rapid periodic color changes to the image display device.
  • the first beam 81 , the second beam 82 , and the third beam 83 in FIGS. 4B to 4 J are just schematic views of the optical paths.
  • the actual light distribution should be similar to FIG. 4A, which is a homogeneous outgoing beam.
  • the number of sides of the prism is preferably even.
  • the invention is a rotating periodic color-regulating module of the image display device.
  • a grating element is first used to split an incident beam into three beams with different wavelengths R, G and B, going to the respective color separating light guide.
  • Filters and a reflective mirror around the grating element are installed in such a way that the light beams reflected from the filters are totally reflected to enter the corresponding filters again. This can effectively increase the usage of light.
  • the light beams After passing through the filters, the light beams are guided and homogenized to enter a polygonal prism through three corresponding light guiding elements. As the prism rotates at a high speed, beams of different wavelengths will be deflected by different angles.
  • the invention can greatly increase the usage rate of light. Moreover, it has a simple structure and a low manufacturing cost. Therefore, it is ideal for mass production in the industry.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Projection Apparatus (AREA)
  • Mechanical Light Control Or Optical Switches (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Optical Filters (AREA)
US10/409,179 2002-10-18 2003-04-09 Rotating periodic color-regulating module of an image display device Expired - Fee Related US6831789B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
TW091124036 2002-10-18
TW91124036A 2002-10-18
TW091124036A TW562987B (en) 2002-10-18 2002-10-18 Rotating periodic color-changing module of the picture generation device

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US20040075911A1 US20040075911A1 (en) 2004-04-22
US6831789B2 true US6831789B2 (en) 2004-12-14

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US (1) US6831789B2 (de)
JP (1) JP3914517B2 (de)
DE (1) DE10325021B4 (de)
TW (1) TW562987B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050212719A1 (en) * 2004-03-25 2005-09-29 Calsonic Kansei Corporation Display device
US20060017891A1 (en) * 2004-07-21 2006-01-26 3M Innovative Properties Company Projection system with scrolling color illumination
US20090174867A1 (en) * 2008-01-08 2009-07-09 Barco Nv System and method for reducing image artifacts in a projection device using a scrolling refractive element
US20090262307A1 (en) * 2008-04-18 2009-10-22 Terry Alan Bartlett System and Method for Uniform Light Generation

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4102807B2 (ja) 2005-01-31 2008-06-18 Ｎｅｃディスプレイソリューションズ株式会社 表示パネルの照明光学系、およびその照明光学系を有するプロジェクタ
WO2007023649A1 (ja) * 2005-08-26 2007-03-01 Matsushita Electric Industrial Co., Ltd. 照明装置、ディスプレイ装置、投写型ディスプレイ装置、照明方法、画像表示方法、及び画像投影方法
KR101550066B1 (ko) 2008-10-07 2015-09-03 엘지전자 주식회사 영상 투사 장치

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5845981A (en) * 1997-12-29 1998-12-08 Philips Electronics North America Corporation Multi-color-band scrolling across single-panel light valve

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6272269B1 (en) * 1999-11-16 2001-08-07 Dn Labs Inc. Optical fiber/waveguide illumination system
WO2003058337A1 (en) * 2002-01-06 2003-07-17 Raicol Crystals Ltd. Multiple wavelength laser source

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5845981A (en) * 1997-12-29 1998-12-08 Philips Electronics North America Corporation Multi-color-band scrolling across single-panel light valve

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050212719A1 (en) * 2004-03-25 2005-09-29 Calsonic Kansei Corporation Display device
US7258448B2 (en) * 2004-03-25 2007-08-21 Calsonic Kansei Corporation Display device
US20060017891A1 (en) * 2004-07-21 2006-01-26 3M Innovative Properties Company Projection system with scrolling color illumination
US7147332B2 (en) * 2004-07-21 2006-12-12 3M Innovative Properties Company Projection system with scrolling color illumination
US20090174867A1 (en) * 2008-01-08 2009-07-09 Barco Nv System and method for reducing image artifacts in a projection device using a scrolling refractive element
US20090262307A1 (en) * 2008-04-18 2009-10-22 Terry Alan Bartlett System and Method for Uniform Light Generation
US7972004B2 (en) 2008-04-18 2011-07-05 Texas Instruments Incorporated System and method for uniform light generation

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Publication number Publication date
TW562987B (en) 2003-11-21
JP3914517B2 (ja) 2007-05-16
DE10325021A1 (de) 2004-05-13
JP2004139017A (ja) 2004-05-13
US20040075911A1 (en) 2004-04-22
DE10325021B4 (de) 2007-09-13

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